Identification of 70 K superconducting phase in the Y-Ca-Sr-Ga-Cu-O system

https://doi.org/10.1016/0921-4534(94)90092-2Get rights and content

Abstract

We prepared Y-Ca-Sr-Ga-Cu-O samples in a variety of heating conditions under ambient pressure. A superconducting sample with Tc=67 K and a superconducting volume fraction of about 15%, was obtained from a nominal composition Y1−χCaχSr2GaCu2O7−δ, χ=0.8 by heat treatment at 1080°C for 3 days in O2. The sample was found to be a mixtur e including (Y,Ca,Sr)3Ga2O6, (Ca,Sr)CuO2, (Ca,Sr)1.75Cu3O5.13, (Y,Ca,Sr)3(Cu,Ga)2O6, (Y,Ca,Sr)4Ga2O7 and Y1−χCaχSr2GaCu2O7−δ. Among them, the Y1−χCaχSr2GaCu2O7−δ phase was confirmed to be responsible for the 70 K superconductivity.

References (11)

  • B Dabrowski et al.

    Physica C

    (1992)
  • M Isobe et al.

    Physica C

    (1994)
  • G Roth et al.

    J. Phys.

    (1991)
  • J.T Vaughey et al.

    Chem. Mater.

    (1991)
  • M Isobe et al.

    Adv. Supercond.

    (1993)
There are more references available in the full text version of this article.

Cited by (0)

1

Research associate of NIRIM.

View full text
Copyright © 1994 Published by Elsevier B.V.